"Pretty Little Liars" Just Revealed Who "A" Is and it Will Blow Your Mind

Here is the most likely theory about who A is so far.

Longtime fans of PLL have suspected that A might have or be a twin, given that this is one of the major plots in the book series. And after the mind-blowing season five finale, the twin plot is alive again — but not in the way that anyone expected. Here's a recap of what we know so far.

Big A was revealed to be a character named Charles that we haven't heard from before, but who is possibly Jason DiLaurentis's unknown twin brother.

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The most compelling evidence to support the twin theory came in the last five minutes of the show, when Spencer watches a home video that shows Mrs. DiLaurentis apple picking with three children — one appears to be an infant Alison, and the other two seem to be identical twins. "Kiss your sister," Mrs. DiLaurentis says, implying that the twins are Alison's siblings. In other words: Alison has two brothers — Jason who we know, and potential long-lost creepy twinster Charles.

Here's the big bombshell: If Charles and Jason are in fact brothers, then Charles is also Spencer's half brother, because as we all know Mr. Hastings and Mrs. DiLaurentis were having an affair. To be totally clear, this means Spencer is related to A, so it makes total sense that Charles is a name that came to Spencer mid-episode in a dream.

Keep in mind that one of the biggest as-of-yet-unsolved mysteries from early on in the series is why Mrs. DiLaurentis was trying so hard to protect the person who tried to kill Alison that fateful night. We knew she was trying very hard to cover for someone. A second son, perhaps?

Another random plot point that supports this theory: Remember the episode earlier this season where a photo surfaced of Ali on a family ski trip, and her arm is broken? At the time, Jason is surprised that Alison doesn't remember it happening. Perhaps Charles was involved — a violent kid who got kicked out of the family who Ali has since blocked from her memory?

Finally, as one Tumblr smartie pointed out (via MTV), the typewritten postcard that Spencer pulled out from behind Mona's mirror contained three lines, each one an anagram for Charles DiLaurentis. It reads: Chandelier's rituals. Sister launched lair. A ruler's list chained. This is obviously not just a coincidence. Charles has to be a DiLaurentis.

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Plus, we know Alison has been the target of A's creepy messages for a really long time — longer than all the other Liars — which suggests that she is even closer to whoever is hiding behind that creepy mask than the rest of Rosewood. Close, like sibling close.

We don't know yet why Charles is so hellbent on ruining the Liars' lives, but one thing is for sure: while his tactics are questionable and mostly illegal, they all seem to be in search of revealing the truth. The Liars are never allowed to keep any secrets. Is it because Charles has been kept a secret his whole life?

The finale episode still didn't totally connect the dots between why Melissa's prom seven years ago played such a central role in Charles-slash-A's dollhouse life. And how exactly is Mona tied into all of this? The rest is still unwritten...

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